Structural and microstructural study of nanostructured Fe{sub 50}Al{sub 40}Ni{sub 10} powders produced by mechanical alloying

• Published in: Materials characterization 2011-08, Vol.62 (8)
• Main Authors: Hadef, F., Otmani, A., Djekoun, A., Greneche, J.M.
• Format: Article
• Language: English
• Subjects: ALUMINIUM ALLOYS; BCC LATTICES; CRYSTAL DEFECTS; IRON ALLOYS; LATTICE PARAMETERS; MATERIALS SCIENCE; MICROSTRUCTURE; MILLING; NANOSCIENCE AND NANOTECHNOLOGY; NANOSTRUCTURES; NICKEL ALLOYS; POWDER METALLURGY; POWDERS; SOLID SOLUTIONS; X-RAY DIFFRACTION
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/J.MATCHAR.2011.05.005

A nanostructured Fe{sub 50}Al{sub 40}Ni{sub 10} mixture was prepared by mechanical alloying of elemental Fe, Al and Ni powders in a planetary ball mill. Structural and microstructural changes during the milling process were followed by X-ray diffraction technique. The patterns so obtained were analyzed using the Maud program. An ordered B2 FeAl phase is formed after 1 h of milling. The observed lattice expansion is related to the production of antisite defects; Fe{sub Al} and Al{sub Fe}. During the intermediate stages of milling, the mechanical alloying process gives rise to a mixture of two BCC {alpha}{sub i}-Fe(Al,Ni) (i = 1,2) structures with the same crystallite size but different lattice parameters, microstrains and proportions. The BCC {alpha}{sub 2}-Fe(Al,Ni) disappeared after 4 h, only the B2 FeAl and BCC {alpha}{sub 1}-Fe(Al,Ni) solid solution persist over prolonged milling times. - Research highlights: {yields} Fe{sub 50}Al{sub 40}Ni{sub 10} was prepared by MA from Fe, Al and Ni powders in a planetary ball mill. {yields} B2 FeAl is formed after 1 h of MA. Lattice expansion is related to Fe{sub Al} and Al{sub Fe} defects. {yields} MA gives rise to 2 BCC structures with the same L but different a, {sup 1/2} and %.